Which of the following is the correct formula for calculating boiling point elevation?

• A. ΔT_b = i K_f m
• B. ΔT_b = K_f m
• C. ΔT_b = i K_b m
• D. ΔT_b = K_b / m

Answer: (C)

Verified step by step guidance

1. Understand that boiling point elevation is a colligative property, which means it depends on the number of solute particles in a solvent, not their identity.
2. Recall the general formula for boiling point elevation: \(\Delta T_b = i K_b m\), where:
3. - \(\Delta T_b\) is the boiling point elevation (the increase in boiling point),
4. - \(i\) is the van't Hoff factor, representing the number of particles the solute dissociates into,
5. - \(K_b\) is the ebullioscopic constant (a property of the solvent), and
6. - \(m\) is the molality of the solution (moles of solute per kilogram of solvent).